Is there any way to automatically initiate voice activated keyboard while driving?

Just wondering if there is any way to initiate a voice activated message while driving? If I say "Ok Google" "Send text to ..." the Hangouts Swiftkey keyboard pops up and I have to press the microphone to start dictating a message. I'd rather not press the microphone key while driving because it's pretty small. Is there a way to avoid having to press that key to start a message?

I also use hangouts for SMS. I always use the "ok Google, sent text" command while driving. It never pops up a keyboard for me. Maybe your voice dictation settings are screwed up?

I think the problem was that when it came up with a prompt that said "use hangouts" I said to do that. My "assumption" was that I needed to specify a program to send the message. Apparently that's not so.